Why is SET TRANSACTION used in an Oracle DBMS?

Why is SET TRANSACTION used in an Oracle DBMS?

a) For placing a name on a transaction
b) For committing a transaction
c) For locking a transaction
d) To set up transaction user parameters.

From the Sonali & Janata Bank Assistant Database Administrator September 2021 – Preliminary (AUST) exam, question 43 of 93.

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